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40K is one of the most important atomic species for ultra-cold atomic physics.Due to the extremely low concentration (0.012％) of 40K in natural abundance of potassium,most experiments use 4 10％ enriched potassium source,which have greatly suffered from the extremely low annual production and significant price hikes in recent years.Using naturally abundant potassium source,we capture 5.4 × 106 cold 40K atoms with the help of a high performance of two-dimensional magneto-optical trap (2D+ MOT),which is almost three orders of magnitude greater than previous results without the 2D+ MOT.The number of the 40K atoms is sufficient for most ultra-cold 40K experiments,and our approach provides an ideal alteative for the field.